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new anne August 10, 2012 15:00

important problem
 
Hi dear friends
l have an important problem about fluent in modeling a spillway.in results i see negative pressure which is not correct.as a matter of fact,pressure must be positive.on slope,pressure must begin with positive mesure and change along the spillwau.but in my results ,pressure begins with negative mesure.i don't know what the problem is!

Touré August 10, 2012 17:17

When you select Pressure, select also Absolute pressure instead of Static Pressure which is chosen by default

new anne August 11, 2012 13:20

Thanks
I try that.but it doesn't work.pressure is still negative.the velocity measures are correct.do you think modeling in gambit is wrong?or is there any special setting in fluent which is effective?
Thank you very much

Touré August 11, 2012 13:46

I don't think it's about the mesh. How did you set your boundary conditions specially for pressure and your Operating Conditions?

new anne August 11, 2012 14:05

For example:in a simple model consist of a simple slope,i use :
Velocity inlet as input
pressure out let as output
Symetry
Wall.

new anne August 11, 2012 14:10

Operating pressure is 101325
And also i apply variable density parameter 1.225

Guava Wang August 13, 2012 03:46

To know the reason, you may check these in sequence.
-pressure outlet is the same as you set.
-pressure drop between inlet and outlet is reasonable.
if this result is available, you then check your simplification model. Maybe there some different between the real model and the simulation model


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